The simplest way to produce an inclusion complexes with cyclodextrins is the direct solubilization of the drug into an aqueous solution of cyclodextrin. Encapsulation occurs immediately but numerous factors determine the amount of complexation produced, such as affinity of the cyclodextrin for the drug, concentration of the components, etc. Another relevant aspect to consider is the ephemeral character of the inclusion complex in solution, since the complexation is produced just by an intermolecular interaction, mainly H-bonds. In fact, the complexation undoes in milliseconds according to a chemical equilibrium.